What is a firewall?
A firewall is a piece of security software that prevents unwanted and unlawful access to computers.
Firewalls can be implemented via hardware or software, and they reduce the risk of your computer being accessed by people you do not know.
For more information on staying safe online, visit the Get Safe Online website.
Get Safe Online raises awareness of internet security, and helps individuals and smaller businesses in the UK to use the internet confidently and safely.